Name

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SXGINFO

Purpose

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Return information on all group parameters in an STSDAS header.

Explanation

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Return datatype, starting byte, and number bytes for all group
parameters in an STSDAS file. Obtaining these values
greatly speed up execution time in subsequent calls to SXGPAR.

Calling Sequence

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sxginfo, h, par, type, sbyte, nbytes

Inputs

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h - header returned by SXOPEN
par - parameter block returned by SXREAD or multiple
parameter blocks stored in array of dimension
greater than one.

Output

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type - data type (if not supplied or null string, the
header is searched for type,sbyte, and nbytes)
sbyte - starting byte in parameter block for data
nbytes - number of bytes in parameter block for data
The number of elements in type,sbyte and nbytes equals the total
number of group parameters.

Method

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The parameter type for each parameter is obtained
from PDTYPEn keyword. If not found then DATATYPE keyword
value is used. If that is not found then BITPIX is
used. BITPIX=8, byte; BITPIX=16 integer*2; BITPIX=32
integer*4.

Notes

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For an example of the use of SXGINFO, see CONV_STSDAS

History

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version 1 W. Landsman Apr. 93
Converted to IDL V5.0 W. Landsman September 1997